diff --git a/capsulflask/http_client.py b/capsulflask/http_client.py
index 9bb1f5c..9f2588a 100644
--- a/capsulflask/http_client.py
+++ b/capsulflask/http_client.py
@@ -34,7 +34,7 @@ class MyHTTPClient:
     for individualResult in fromOtherThread:
       if individualResult.error != None and individualResult.error != "":
         current_app.logger.error(fromOtherThread.error)
-      toReturn = toReturn.append(individualResult.http_result)
+      toReturn.append(individualResult.http_result)
 
     return toReturn